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Title:
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Comparison between large reference cell calibrated by ESTI-JRC, NREL and PTB, performed at ECN
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Author(s):
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Heide, A.S.H. van der; Winter, S.; Emery, K.; Zaaiman, W.
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Published by:
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Publication date:
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ECN
Solar Energy
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1-6-2005
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ECN report number:
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Document type:
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ECN-RX--05-004
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Conference Paper
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Number of pages:
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Full text:
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4
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Download PDF
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Presented at: 20th European Photovoltaic Solar Energy Conference and Exhibition, Barcelona, Spain, 6-10 juni 2005.
Abstract:
Calibrations of large area reference cells
performed at ESTI-JRC, NREL and PTB were compared at ECN. The cells
that constitute the so-called World Photovoltaic Scale (WPVS) are only
4 cm2 in size. In this study for the first time large area
cells (100 cm2, 156 cm2, 225 cm2) have
been used for intercomparisons between the leading calibration institutes.
The short circuit current calibrations at ESTI-JRC and NREL were performed
in a solar simulator, including a spectral mismatch correction. PTB
uses absolute spectral responsivity curves at different bias levels
for calibration. For the calibration comparison at ECN a 156 cm2
cell calibrated at NREL was used as a reference to determine the (mismatch
corrected) short-circuit currents for all other cells in the ECN solar
simulator. The differences between specified calibrated short circuit
currents and measurements at ECN were found to be <1% for 156 cm2
cells. The largest deviation for all cells, after correction for beam
non-uniformity was found to be 1.3%, for a 225 cm2 cell.
The conclusion is that the variation of calibrations performed by the
three calibration institutes for cells upto 225 cm2 is within
2% error margin that is specified for the small WPVS cells.
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